Abstract: A magnetic alignment system can include a case with a magnetic alignment component that is configured to align with a magnetic alignment component of a wireless charging device. The case can support a portable electronic device, such as a smart phone and include an NFC coil for communicating with the portable electronic device. The magnetic alignment component and the NFC coil can be provided as an assembly that is embedded within a body of the case in a manner that provides a low profile and improved aesthetic appearance.

Abstract: An electronic device may include components that emit and detect infrared light. For example, a head-mounted device may have optical modules that present images to a user's left and right eyes. Each optical module may have an infrared light-emitting diode that emits infrared light that illuminates an eye box at an infrared wavelength, and an infrared camera that captures an image from the eye box at the infrared wavelength. A low-reflectance coating may be applied to one or more electronic device housing walls to prevent interference with the infrared components or with the visibility for a user. In particular, the low-reflectance coating may be a low-visible-reflectance-and-low-infrared-reflectance coating that exhibits low-reflectance across both visible and infrared wavelengths. The low-reflectance coating may be formed from carbon nanotubes and at least one organic solvent with zero polarity to ensure a low volatile organic component in the coating.

Abstract: A head-mounted device may have optical modules that present images to a user's left and right eyes. Each optical module may have a lens support structure that supports a display and a fixed lens. Vision correction lenses may be removably coupled to the fixed lenses to help customize the head-mounted device to the vision of a particular user. A user may view images on the displays through the removable and fixed lenses from eye boxes. The optical modules may include infrared light sources that supply infrared light to the eye boxes and infrared light sensors such as infrared cameras for gaze tracking and authentication. The lenses may have optical surfaces covered with coating that enhance optical performance and may have edge surfaces that are provided with structures to help reduce stray light reflections. The lenses may be configured to pass visible and infrared light.

Abstract: An electronic device may have input-output devices such as keyboard keys or other buttons. Components such as cameras and other devices may have trim structures. A housing may be used to form an enclosure for the components. Keyboard keys, trim structures, and/or other device structures such as housing structures may be provided with wear-resistant coatings. For example, a keyboard key may have a glyph such as an alphanumeric character formed from patterned layers of ink. To prevent wear to the key and glyph, the glyph may be coated with a wear-resistant coating. The wear-resistant coating may be formed from a polymer with embedded mineral particles such as aluminosilicate particles.

Abstract: A magnetic alignment system can include a case with a magnetic alignment component that is configured to align with a magnetic alignment component of a wireless charging device. The case can support a portable electronic device, such as a smart phone and include an NFC coil for communicating with the portable electronic device. The magnetic alignment component and the NFC coil can be provided as an assembly that is embedded within a body of the case in a manner that provides a low profile and improved aesthetic appearance.